Hi Tolu,

I had the same problem yesterday, but found this solution.

In my case the user is allowed to create a new shipping address during checkout, and be able to select all their addresses and stuff.

When a user creates a new address, this is my code (i am using an ajax call to call this method):

 [HttpGet]
    [WebMethod]
    public ActionResult SaveShippingAddressForm(string Name, string Email, string Organization, string Address1, string Locality, string PostalCode, string CountryCode, string Phone, string culture)
    {
        try
        {
            //    dynamic item = JObject.Parse(json);
            var merchello = new MerchelloHelper(false);
            string key = string.Empty;



            try
            {
                ICustomerAddress address = new CustomerAddress(CurrentCustomer.Key);

                address.FullName = Name;
                address.Address1 = Address1;
                address.AddressType = AddressType.Shipping;
                address.CountryCode = CountryCode;
                address.Locality = Locality;
                address.Phone = Phone;
                address.PostalCode = PostalCode;
                address.Region = string.Empty;


                IAddress iAddress = address.AsAddress(Name);
                iAddress.Email = Email;
                iAddress.Organization = Organization;

                // Temporarily save the address in the checkout manager.
                CheckoutManager.Customer.SaveShipToAddress(iAddress);

                if (!CurrentCustomer.IsAnonymous)
                {
                    var createdAddress = ((ICustomer)CurrentCustomer).SaveCustomerAddress(address);
                    key = createdAddress.Key.ToString();
                    CustomerContext.Reinitialize(CurrentCustomer);
                    MerchelloContext.Current.Cache.RuntimeCache.ClearCacheByKeyExpression("merchello\\.itemcache.*\\." + CurrentCustomer.Key + "\\.");
                }


            }
            catch (Exception ex)
            {

            }

            //new address > save to customer
            CultureInfo ci = new CultureInfo(culture);
            CultureInfo.CurrentCulture = ci;
            CultureInfo.CurrentUICulture = ci;
            string html = GetShippingAddressHtml(useDefault: false, key: key);
            return Json(new { success = true, content = html }, JsonRequestBehavior.AllowGet);
        }
        catch (Exception e)
        {
            return Json(new { success = false, content = e.Message }, JsonRequestBehavior.AllowGet);
        }
    }

these two lines:

CustomerContext.Reinitialize(CurrentCustomer); 
    MerchelloContext.Current.Cache.RuntimeCache.ClearCacheByKeyExpression("merchello\\.itemcache.*\\." + CurrentCustomer.Key + "\\.");

Make sure the freshly saved address, is also refreshed inside the cache.

EDIT:

I had the issue that when i called SaveBillToAddress/SaveShipToAddress, my address was deleted from the Database. This is because the customer in the cache is being saved again. When you use those 2 lines, it makes sure that the customer in the cache is being refreshed.

hope this helps!

Puck